mass hysteria mass energy • mass medium · · · Info · Definitions · Synonyms · Characters · · mass hysteria · · Text Common · · Latin · · Scripts 13 · · Length 5 · · Syllables Definitions · · · (noun) a condition in which a large group of people exhibit the same state of violent mental agitation. Synonyms: mass hysteria, epidemic hysertia. · · Noun Definition 1 Synonyms · · · epidemic hysertia · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 m latin small letter m U+006D r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 y latin small letter y U+0079